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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f61823416cc93e3f27a4623714a97acdb0e6b92a6ea0e31021343465548a233' 
  AND token = 'YNE3SvAnBzvu0938OQksKnv5e8JVGN4HJSrpqnVa/J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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