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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca62e66611b7449d002310880ab53e31bb76bce3366732d868b40fe91f21009' 
  AND token = 'zcDHHDGZbkgiKXRWSqrP/0bv6t2dZGPD+mWJex8fmts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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