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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf33999b5baf9887eac2c2e8f3c1048fc8b355c533db5266c55e2a321a4b3e6' 
  AND token = 'DDAUNfiSSqUFpciBiMIoyqqiQQMwUYaxivSlN1smG0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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