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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf33dcf487f8e95f6fc404639f62049846a41e334b140fc87cc2e5cea67cb0a' 
  AND token = '1Y3WwHC2YnyV6RMIWkAqyiQM0MWkoumpEni9cywgnzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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