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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f347b8ad34b07723ca105a5f75006e1e7d84becf442ac5342a2206de2efe6bc6' 
  AND token = '0pDPvy6jERS+ej6MtDTjl1ZO3VmOC9q4u7awF+036gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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