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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c066b9c05c254216a0de7af0f15910bc4ebdc8100b0e55cef40d40509ad669e9' 
  AND token = 'VySCeLTY6j14bx7DSv+O4R091zqrFsHpzOi1KrOf0w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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