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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76103b3b476cdfb8f9c8bf903e0121ba97d7294098e5bffdf1725c190b2190c' 
  AND token = 'j0sVbQouu7qN8/GVF+NiitdZoPzwZX6+L1l1qjdCQGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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