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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9b098f2abcff2fa025f6ba65b4af3bbadd3f8f836a29d0cf6b775c074a3a67' 
  AND token = 'Lns/dcbgQVnoDtsArdUKtZEDWqf4KSLPAq19dcTv9LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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