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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00058ceeb1593b14c4a8ca59b7905fb673836895190d9dd0b0248e202af50fb6' 
  AND token = 'wCGGnzceSxS03ERq927+eFbzsUR4ZPhEterLuAOdPrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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