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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a86b8e8f52aff09cbe03a15521286686d4119f3c0049c75e6a074dfb9e72b0b' 
  AND token = '5QQUwa3xhy/CCYkfP1VIkWGPgc7gWrx0/a837yWFJNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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