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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2e30b516f8ca9ef815c99df84fa49bff6a37f5ccfa3a4d7091d1e54fbeb2b5' 
  AND token = 'ycqDxkGUyZC0qmq+cUkSHM0ioOyw/xNXzQthMNvdJb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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