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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b9dcfe2c55be7bf09333335fa78853db0052c7811c198a31e7f098bdf06786' 
  AND token = '1+MQjaIly59RwCae2j48Hlx2WRLLS8KTiLPM9CQARyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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