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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda5f9c6e15171208ae8cf6b07653ddb646f6b212b57a8f7dba9e620f513a646' 
  AND token = 'd274qHhnuM5PxK/7XSH3y0YROPAM6gid2srd70Rw2oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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