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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b7e71226f7eaec46053b0e28221e0d31c01f544034af3756060e885af6a940' 
  AND token = 'OKhFGhmXgd689gEh8gwmU9AlV2qlC4NyzR6K88Q4LAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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