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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf6b1a93a17fe51ef78202fb2cecb1ea6dd511be03bb83e33685aeb7c70517b' 
  AND token = 'QaxqM9PmiqEJZC0JBM6ksvarovM1sLli2hl/ZuYBmBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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