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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38305dac737ae7c99cdc547310dc992ebfe5d3d347761e6f0b8c7129891742f' 
  AND token = 'M5gZ60TE/qhwE3URmhzzs0ZFXfs6Ayh7QQ8eibozuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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