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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a10aeb04e37054043856359529d9c7f9be98345a2ccd31d826b8eda7913940' 
  AND token = '2jwFR4yXFb3Pc/PymqHgEfvEC92RUJrqCq5/DQuNZLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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