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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3784c82c556e3b35fa9220148cf9208d5f98803a9ebd3c7b99b808d33d99b098' 
  AND token = 's2UdBeE/Td9SgGe4zKy3Hw1IhV9/hBllyD14LVD5s24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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