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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c70fdaee1ae3708a89db49832cd2909cddb970e0f7bbf4db6ccf15e871652f' 
  AND token = '3JsA700hhaQcercrWdBUOK+GD1Fn/bDhpB0elKeSDHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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