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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd0dc84043471739d07821147a61c9acc2476fbae3b4ad36bb4feacb816b316' 
  AND token = 'YvJNfRlYbcuBifTcYszPiEoV0mZmNPF6GH2xyy3Q6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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