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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbec56b92f59331159c932bb0d3a093350b674e7f08fa732ee504453334782f' 
  AND token = 'd+gEKndeX2H6lwOW32kcj/L8NZcX5B62OLhAwr2cnxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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