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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045bbc8a85e6a63d6b21e7b48fef59a5ed7d1492854f5bbb740e8dfea3b6ed0a' 
  AND token = 'AgfLCtsHnFOFmXvh3lkhpzWNN7C9LhuAcJ4A7QwTmp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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