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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641de0c7e7caeb8d8b28f11ed3dda0a9c16dbc6480c2495240bbfd94e5d7efd5' 
  AND token = '/JtA0/L9z3jjRJGJ7aThq8F/jp17F2imT3lv4JAo90E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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