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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f5d8805b178c642c87e9f403c991259a703ba7c05f6bcdb57a6a3fc917967e' 
  AND token = 'uKPy7g6YY8AjyMoOeNGDEevumGXAHX19agdYyV9I9fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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