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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29c49f49c4cfc574033f39289d78188dae5a4e7d3d533860208c45933fe9040' 
  AND token = 'NOBPbWD2rOuMhO3yLsW+APA0GVv5GgRmOw1YvAX3DzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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