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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536011140ba970e1fb53a1104c5d0612f5157b0bc7542e87ae578d51e1d1b3ba' 
  AND token = 'UDOXNJ+rJn4heCgoscXzZMLjTvpS9zA5T9dIsrof2sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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