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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3094438c16a468dd60142e3b98100941184f9d7007a22e66fa7423172ac9add' 
  AND token = 'S9lsQPhlwsvSPete3jPTGC6hzhX1kY98pE2Kdz/ZmT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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