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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9c02c3bd557f433da2cdf0574bc4daa2a823ffe4c64cb66b127901734f9255' 
  AND token = 'uCHfIjibdJDI7RHry7Z/PmUOIgchwfwiJWqiEVFFIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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