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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a875908ee2b150ab5ab9355e1ce106b5a3d5e19899e77c974f78b288ed8f986c' 
  AND token = 'wOTj1qcs4iaB0kZoc7LvtH7BKRjX4fYM7SKyhc3aZ/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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