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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a156fb10faaea65e2b58b699e1377375d167f2451b3f467f13948206e3921718' 
  AND token = 'O6VOoFVbHSjPUaTuFVK8xGRBZaPnCj2ihyITBmMXkE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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