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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230aeb7dd675abecaa94780afc618f87de72977d785ab4964f9464a3aee2bb1b' 
  AND token = 'xj0T8sXL1bs/UWU0pqyJ7s8hpEydSkMMRfT2bE53l4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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