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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f0fc4713a528fb13fa4569cfe538ac7c00d4680de6b8bafd4e56b0331cdcb0' 
  AND token = 'fHVia3jw/uUCgaWy3/44Cazzzp4h4w5zFbId6QvOKPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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