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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276d0a08d7f7e39e943eb0ed5af37c79a71a6c3cbbad79af6f87d84a6c43de2d' 
  AND token = 'z1VmMiK7LlAQbaU5lANq0NfqOB+cJ9m3JSr2ZCQqt9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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