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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e96c837d13091c3f841055c9725e0a11e8008cf2dca7ce1be8df5f862edf1c0' 
  AND token = 'VNGbl6qCNffUKrxxGYcelueEnILXw9YU9DN9xdCFdyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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