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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9a9002affadac91f379a37a375504807bc01e17c487daec51cc23988012c0e' 
  AND token = 'ngiZAbPh2Dxnrv9GGkzOmK8lrKj6Bo1R3Ovl66C62mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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