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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115a7326f59ec3ef88fd53e3020f12ca3628b36fb18f3a514a1f9182c4f282cc' 
  AND token = 'UJP8fQ3MqeyldpYt89YiIqx7DktOxPVFFJggOnwTlKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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