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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fb3e2f5884998f187d2cf551332da58f409edfae2a5798678c50ec2d18bf1b' 
  AND token = 'Gi/HiVzAByYN5hQmtxJws3kJC0FrkHicoU7u9Ab9Dzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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