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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b8e5eabab57485cf30c8790af2dcc5b424fcc08aed588a10ef3ae926cd9cda' 
  AND token = 'Mw8yWYrcxxG+awjzsg4toX4q9Awyp2Qq9YC8qkEyq1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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