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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85164750592e4fe725ba5ca73b369edbb054e600740f17509c5cecba13c18b2d' 
  AND token = 'm29pgt3vAPqbfdZdSdyOQJRcI1F3IjxEmE46XDkyORw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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