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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eb83113531a2cd8bdad359dc39be6536c67c526e31f02bfde099a6675740c7' 
  AND token = 'f/9qUTeg8runOPawevIrpeTCQSspXvuMOjHP1IcZ3Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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