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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c67a2db926e4b274dfd9dc5036bd8fd6523a56b818f6887095ae97896548dd2' 
  AND token = 'HEbqL9LOI9oRTPeX3mVnFH055do0stgwqXt4N2Z0hCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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