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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe7a72494ba24b71d037c170719ba75d5000daf00b44dcc257461cfa33d11f4' 
  AND token = '9Pe8h7oXE2e6wVzyGPOgwVPCio3rvx/THAgD8eRLXB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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