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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a60c5eca09bb748d1031dddd85246634d172fbbcb40dd09bb931451b5b1c1b' 
  AND token = '3KHLl6Eie5pGQoZRUwAEEBD/tL5tdZqWJ9urZhAGbag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}