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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe439c3edb03efee1381a033adbe5d7d39714595f5d11786d18d98d23c7d27f' 
  AND token = '+Gt3ZPi2Z3rwDt7QPkr8BfTrttXluxyhGRVbX+OipUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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