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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3957a22e20c3a7ec6011b13771bef05bd69ca46178216a181b76e600c8066e60' 
  AND token = 'XmifC8IOR5EjEZA+2HeSRuRU+MC8BUE7TkwvhHrNFok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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