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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47f33a2d06cdcf5ccbc7412b3b22ca3a9cf531faafb2ac00f3e500e257556e4' 
  AND token = 'JCsQKct7RzMUswUaOTqQxKdiNq/degJvBKH+sGBJ9jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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