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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001ddd1dedb580c9cbee8d52d3e05e22fcaa7fc456fa50026d4229b5fec4181f' 
  AND token = 'vGZHJqN1Yc0LaZtnTPCgC2QmXyRi3jpAyGC7/HynlK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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