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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9860637b280a1fa9a15179b58a959c95978697fbc2b27e75fcc5eb1ecd1ca0bf' 
  AND token = '/Ok4+lP+rdQjSX1qt30VI+hU1yPknIj7jLwQW2ss89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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