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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907099a99b57e7b65b43e68f599b780a382d7bb0d440f216bd17f9f682551895' 
  AND token = 'v7l3RPrqVWvxSxgi9pFpSJeECMRqoIARIreQpQCPUgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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