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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e357d5b3379cef08b92cf7c88f81507b9d1cb2756403b293adfbfa58e12e82c' 
  AND token = '7V1Qf9K3Sscbkudc+qDjKZG2aIKaCJe55wrD209kDkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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