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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580b3d142fad9bcb205b338db403373e795c9e8c9b6d6ee5626b2f701d7102ce' 
  AND token = 'hJErThxpXh+WNtk3dMMLcZ+5PFjXI6N+41j+TsBGEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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