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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc37a040ececff1b73967b87a6cc21068b2633911ec3137ab7fd40478b7c4841' 
  AND token = 'JlsVnByycKxG5DM9Gb9icYUYn0g9SB00h66P4q1BSzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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