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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a442cae8d9d900a8a3a7d9cb420a1be6759c6cc9187d28918334515493c43ce8' 
  AND token = 'jQ/6QHcsGOCJhwPTbxmRZNORPdmJPOa2sjM/vHcARlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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