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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce8f48fa8dcce2e38baafed6931f9aac879158466ca905eeaef47b46bf8bcc3' 
  AND token = 'Hhox9kJJCBz4snuhTr60a8nXgnnlfZcAKwBm7rvhPPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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