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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ae507a13e9e420a4d449f71c7978527d8abf8291a4b5feec7ae3554d34e8e4' 
  AND token = 'xxhpdTN3Acg+CsDmJoR0DlCYRiEI5/9Ld2xZG/50d2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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