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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6e6cfb55c797bfb5319cc2db212f132453fe6e5704eadc4847cecd5ba6a43c' 
  AND token = 'zy1GI11/6fDS0iRCrVXkuhQJWeaO/B6tElkmY/KU2I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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