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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27044b04579346f85be3721aa96724aefa19f39e6ec48305cc70893c069d80ac' 
  AND token = 'ODUfVX20JRu2MBzLtj+wLmO7vUw8y51wcAh2rEn85A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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