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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6909f81804cacc1a18d57785baa71ce82f60fc0e6fcc8e988b945a88d839fe3' 
  AND token = 'JArodvmrYL9Ia0vf12qOhJfYnw1m9b2MfhjlbKDKglI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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