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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51110cf0a9fc63b47b4fe90d5cafbb83bf415a1a22adb3e3b3f5d109ab12ffda' 
  AND token = 'XkTBvn3R6upsbnrhqN+li4BpRdm/VvvMOVYe3K6eNnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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