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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34388de12b6c1be1fb5c6b122b2e355f2fef0c34e5331eba1aa4e035af17617c' 
  AND token = 's/xZ3Pncy4NWERTELg8+75px8bQaK/Yxxh+e+Zwdk8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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