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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc24b21de7877d90f525e1d5540f7d45941fbe35365a17591aed80cbee1df900' 
  AND token = 'MoDo40LCkxijAk7UO/IcMBnh3x5Z161MeFV6S8u3jCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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