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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e66f67c36ad8032222abc2b2b4d7c5ebfb5cc0a50697c8e945427a5168517a' 
  AND token = 'eov47P3DZuJrC7WBj0mRnyPbhaH0IsSzhxCtbbEnFI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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