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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb515a5fa733bfe53384428de354d3f604782682e9de985fc8341c1d7142542a' 
  AND token = '275JRV4OJtGOYuUUBqQk9AilnVHWRVQU6XQFl8ycwcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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