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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577021da7ca5e99389e041d11327b3ff029aeb574e4b9c6e1b6db4190d3e31a3' 
  AND token = 'ZM8sro46+nVD+Bu3Es9HhKc/vCNWQytxpmTeYIKJ7N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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