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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a46e30eaf463cdb3a9f881568b6c88b99264202233768fc8ee211bbbdcb2d7' 
  AND token = '58EHPnhQG+bgaWQ1RDo1vKivaz0f03G5mec9JcFr+WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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