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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e633e79061de6f870aa7b66631287bf5bb1c51d069291e53be10fca789a26ec' 
  AND token = 'a76yld8ENsllrc3xa1hOMjAIhQ6Kjxt7dmYkDQbITd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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