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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb34beb46ef5796e4a8b803ce95b487e53e8e90e0044cb7ac0207a0da81d79e7' 
  AND token = '55tkz3TpHoiBQBHz5i/q/ha6/k85Wd2EQpIXEUFeqBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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