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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ca9f5d6897acd11fcd33c6c571217bb48792c20d03cc2702e2a1ca4f7c247c' 
  AND token = 'HsfnD4nbl+wC1eKdSyusfFHkaXn8Vvm5BCMKD0Q9uEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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