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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe137f16f4b33817fc9c9ea33324f881fd8d161948f0a02e1dd971db8719817' 
  AND token = '8M/0fNf1oyZITbT3xmXW+9LXgtxlTlObr7QPDcy1IUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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